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If the motor is not turning, see if it's moving at all when the proper controls are activated (e.g. joystick). If it jerks/moves a tiny bit then stops, it could be a gearing/chain/belt problem. If it's not moving at all, check the speed controller, if it's LED is blinking, it's not getting a signal from the robot controller. More details would help, so we know what's connected, what's working, what's not working, then we can help you troubleshoot more.
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